Monday, 3 June 2019

April 2019 Summary

In Brief:
Unsettled first half and very cool first week.  Fine third week and very warm for a time over Easter.  Cooler and unsettled final week.

Temperature: [Minimum]:
Lowest: 2.1 degs C on the 12th.  Since 2015 every April has had a colder night than this.
Highest: 12.0 degs C on the 23rd.  Highest in April since 2013.
Average minimum:  7.18 degs C.  Highest since 2013 and 8th highest of the last 16 Aprils.
Nights with temperature below 5 degs C = 5. 
Nights with temperature below 0 degs C = 0.

Temperature: [Maximum]:
Lowest: 8.9 degs C on the 14th.  Coldest April day since 2013, when there was a very cold spell in the first few days.  Below the coldest day in March 2019, which was 10.7 degs C. 
Highest: 24.2 degs C on the 20th.  Hottest day since 4 August 2018, and hottest April day ever at this location - since before 2004.  Previously this was 22.6 in 2015.
Average maximum: 14.62 degs C.  Warmest April since 2015 but 6th coolest of the last 16. The record-breaking temperature over Easter did not quite compensate for the cool weather throughout the first week.
The average April max for the last 3 years has been within the range 14.57 to 14.62 degs C.
Days with temperature above 20 degs C = 3.   19th, 20th and 21st.  Most for April since before 2004.
Days with temperature above 25 degs C = 0.

Rainfall:
Total:  76.5 mm.  Although a relatively low figure, there have been several fairly dry Aprils recently so 2019 was the 4th wettest since before 2009.  2009, 2012 and 2018 were wetter.
March 2019:  121.9 mm.
April 2018:  95.8 mm.

Wettest day:  16.7 mm on the 15th.
Other days with 10 mm or more:  14th (13.3 mm) and 4th (10.9 mm).
Wettest spells:  14th to 15th: 30.0 mm, and 2nd to 8th: 29.9 mm.

Driest spell:  17th to 22nd: No measurable rain, and 9th to 13th: 1.1 mm.
Completely dry days:  11 or 12.  3rd fewest for April since 2016.
Days with no measurable rain:  13 or 14.

Cumulatively: 2019 = 364.5 mm.
2018:  599.8 mm.  [-39.2 %].

Thunder:
None this month. 

Pressure:
Lowest: 988.2 mb on the 4th.  
Highest: 1034.5 mb on the 20th.

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